THE EFFECT OF PROSTHETIC LEG KNEE JOINT TYPE AND STATIC BODY POSTURE TYPE ON MUSCLE ACTIVITY AND POSTURE STABILITY IN PROSTHETIC LEG USERS

• Main Author: Agdiana Dewati, Alifta
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/83614
• Institution: Institut Teknologi Bandung

In Indonesia, there are various types of prosthetic foot designs that are tailored to the needs and activities of users, ranging from prosthetic feet for daily use to special designs for certain sports and work activities. One feature that is currently commonly used is brake control. Research conducted by the Bandung Institute of Technology produced a prosthetic leg prototype with the addition of a brake control mechanism that is expected to reduce muscle activity and help maintain the level of stability in the lower extremities. For users of prosthetic legs for work, muscle activity and stability levels that are not ideal have the potential to reduce physical mobility functions and change the balance point which has an impact on reducing work performance. In addition to the type of prosthetic foot design, muscle activity and stability in prosthetic foot users are also influenced by body posture during work activities. This study aims to determine the effect of awkward body posture and knee joint type on muscle activity and postural stability in prosthetic leg users. This study used a within subject ANOVA design with a total of six participants. Independent variables include body posture (upright, bent 20?, and bent 80?) and knee joint type of prosthetic leg (existing and prototype). Electromyography signal measurements with band-pass filter 20-450Hz on gastrocnemius (GC), rectus femoris (RF), biceps femoris (BF), and erector spinae (ES) were performed to evaluate the level of muscle activity. Centre of pressure (COP) measurement was performed to determine the level of postural stability of prosthetic leg users. In addition, a subjective approach was taken by measuring the level of discomfort using the Borg CR10 scale and measuring the perception of stability to see the consistency of the measurement results objectively. This study shows that postural stability and muscle activity is affected by awkward postures. The bent posture 80? has the highest influence on both variables, while the upright posture has the smallest influence. In relation to the results of this study, there are recommendations given to improve the work performance of using prosthetic legs in terms of features and postures performed.